NCIX has the Seagate Momentus XT ST750LX003 750GB 2.5" SATAIII Solid State Hybrid Hard Drive for a low $99.99. Free over $100, otherwise $8. Tax in CA. This is about $20 less than the next best price, and one of the lowest prices we have seen.

These are some of the fastest 2.5" drives (besides a SSD) and most reviews report great speeds especially in RAID 0. Includes a better than normal 3-year warranty.

This hard drive contains 8GB of SLC memory (which is more expensive and durable than traditional MLC) and uses an Adaptive Memory technology which learns what you use most often and stores it on the flash memory for faster access times. Although definitely not as fast as a flash memory, it provides an affordable perfomance boost compared to traditional 7200RPM 2.5" hard drives.